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Question

# A photoelectric cell is illuminated by a point source of light 1m away. When the source is shifted to 2m then

A
each emitted electron carries half the initial energy
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B
number of electrons emitted is a quarter of the initial number
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C
each emitted electron carries one quarter of the initial energy
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D
number of electrons emitted is half of the initial number
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Solution

## The correct option is B number of electrons emitted is a quarter of the initial numberIntensity of light source is I∝1d2∴I2I1=(d1d2)2=(12)2=14⇒I2=I14. Number of electrons emitted depends upon the Intensity, and energy of the electrons emitted is independent of the Intensity

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